Classification of Radinsky 1967
Fm. †Hyracodontidae Cope 1879
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G. †Epitriplopus Wood 1927
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†Epitriplopus uintensis Peterson 1919
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Invalid names: Epitriplopus medius Peterson 1934 [synonym]
G. †Forstercooperia Wood 1939
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†Forstercooperia borissiaki Beliaeva 1959
†Forstercooperia grandis Peterson 1919
G. †Triplopus Cope 1880
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†Triplopus obliquidens Scott and Osborn 1887
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Invalid names: Prothyracodon intermedium Scott and Osborn 1887 [synonym], Triplopus grangeri Wood 1927 [synonym]
†Triplopus rhinocerinus Wood 1927
Invalid names: Eotrigonias Wood 1927 [synonym], Ephyrachyus Wood 1934 [synonym], Prothyracodon Scott and Osborn 1887 [synonym]
Fm. †Hyrachyidae Osborn 1892
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Invalid names: Hyrachyus douglassi Wood 1934 [nomen dubium]